A plastic leaching unit for receiving water when buried in trenches in soil comprises a plurality of pillars interconnected by struts. A canopy made of sheet material is attached to the tops of the pillars. The pillars are arranged as spaced apart integral assemblies to enable lateral and vertical bending of the leaching unit, for conforming to a not-straight trench. Preferably, the canopy comprises a second perforated sheet overlying a first sheet having larger perforations, the combination arranged for flow of water and gases while hindering soil particulates. Preferably, the canopy extends a greater amount from the first end of each unit than from the second end, to facilitate end-to-end mating of the units. Leaching units may be stacked one upon the other within a trench.

The invention relates generally to an arrangement (100) for connecting sewerage system and a French drain. The arrangement for a sewerage system comprising a French drain comprises an inspection well device (102) suitable to be connected between a first drain system and a French drain system for enabling installation of said French drain at least partly under of said first drain wherein said inspection well device (102) further comprises a bottom part (104) and a tube part (106) protruding from said bottom part (104) whereby preventing the unwanted water and dirties entering into said French drain.

A French drain drainpipe with built-in means for flushing iron ocher out of the drainpipe, out of the perforations, and out of the gravel surrounding the drainpipe. Said means may include chambers for receiving pressurized washing fluids and exit orifices from the chambers. Fittings are provided for connecting the chambers to a pressurized source of washing fluids, such as hose fittings for connecting to a normal household water supply.

A French drain drainpipe with built-in means for flushing iron ocher out of the drainpipe, out of the perforations, and out of the gravel surrounding the drainpipe. Said means may include chambers for receiving pressurized washing fluids and exit orifices from the chambers. Fittings are provided for connecting the chambers to a pressurized source of washing fluids, such as hose fittings for connecting to a normal household water supply.

An apparatus for increasing the utility of gravity conduits by using their underutilized headspace for pressurized conveyance.

A power generation apparatus using a head of wastewater in a building includes an inclined water discharge pipe connected to an end of a wastewater pipe installed in the building through one end thereof, to divert a moving path of wastewater falling through the wastewater pipe, a cavity part coupled to the other end of the inclined water discharge pipe, to receive the wastewater discharged through the other end of the inclined water discharge pipe, and a rotating body installed inside of the cavity part, to be rotated by the wastewater discharged through the other end of the inclined water discharge pipe. Power is generated using a head of wastewater generated in a high-rise building or an apartment, and electricity generated using the wastewater is used as common electricity inside/outside the building. Therefore, smooth power supply can be achieved.

A plastic leaching unit for receiving water when buried in trenches in soil comprises a plurality of pillars interconnected by struts. A canopy made of sheet material is attached to the tops of the pillars. Preferably, the canopy is perforated and is overlaid with geotextile. The pillars are arranged as spaced apart integral assemblies to enable lateral and vertical bending of the leaching unit, for conforming to a not-straight trench. Leaching units may be stacked one upon the other within a trench.